Fix LineLength for @todo comments

Problem/Motivation

Part of #2572709: [meta] Fix 'Drupal.Files.LineLength' coding standard

Steps to reproduce

Proposed resolution

Wrap @todo comments at 80 col.

It is not possible to enforce a change for this with phpcs.xml.disl

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet